white round object flew from the open sky into the clouds and disappeared

A white round object like a disc flew from northwest of Taal to southeast at 3.30 pm (towards Batangas City) at Saturday 17 of march. The sky was 2 octas covered with cumulus clouds. The object flew from the open sky and passed under the clouds and disappeared and appeared again, and finally disappeared into the clouds. Even though the end of the clouds were in sight, the object did no more appear. The size of the object was around 30 feets in diameter. (cumulus, altitude approx. 2500 feets) The speed of the object was approx. 500km/h, much more fast then the clouds. That’s why I cannot think of a weatherballoon. There was no sound and Saturday was quiet in our place.
But 12 ours later I went out of the house (3.30 am)because my dogs were barking to go out. So I opened the door and it was silent. But I heard like a plane was circling at the sky for more then 2 hours. The sky was open, no clouds, the stars were visible. Now I thougth for a moment of a unmanned spyplane…?? The location of the sound came from the same direction were the object disappeared into the clouds 12 hours before.